Solar Wind Formation
Investigating structures in the ambient solar wind as tracers of solar wind formation. We use remote imaging data and in situ measurements in the heliosphere.
Solar Coronal Heating
Researching active regions and quiet Sun plasmas by developing new analyses of the multi-wavelength Solar Dynamics Observatory/ Atmospheric Imaging Assembly (SDO/AIA) data. Use physics-based coronal flux tube models to understand coronal heating and for the interpretation of line-of-sight effects in coronal observations.
3/2012
-
Present
Research Astrophysicist
NASA Goddard Space Flight Center,
Greenblet, MD, USA
2010
-
2012
NASA Postdoctoral Fellow
Solar Physics Laboratory, NASA Goddard Space Flight Center,
Greenbelt, MD, USA Investigation of coronal heating in active region loops using time series analysis, physics-based coronal loop models, and the multi-wavelength SDO/AIA data.
2005
-
2009
Graduate Research Assistant
Department of Astronomy, Boston University,
Boston, MA, USA Studied non-turbulent periodic density structures in the ambient solar wind, their affect on the Magnetosphere, focusing on the ULF wave response, and their possible source region and source mechanism. The main tools used were spectral analysis and time series analysis of Wind/Solar Wind Experiment data, Solar TErrestrial RElations Observatory/ Sun Earth Connection Coronal and Heliospheric Investigation white light images, and Geostationary Operational Environment Satellites magnetometer data.
2004
-
2004
Graduate Teaching Fellow
Department of Astronomy, Boston University,
Boston, MA, USA Responsible for teaching four Astronomy 202 lab sections per week; taught astronomy and space physics material complementary to main lectures; running laboratory experiments and discussion/office hours; grading homework assignments and lab reports. Attended bi-weekly class lectures and weekly teaching fellow class.
Ph.D. in Astronomy, Boston University, Boston, MA, January, 2010
"Periodic Solar Wind Density Structures"
M.A. in Astronomy, Boston University, Boston, MA, May, 2007
B.S. in Astronomy and Physics, University of Washington, Seattle, WA, June, 2004
American Geophysical Union (AGU)
Space Physics and Aeronomy (SPA), outstanding student paper awards committee co-chair and member of AGU SPA executive council, August 2011-Feb 2013
Outstanding student paper awards judge, Fall AGU meeting, 2009-present
Co-organizer and session chair of Fall AGU SPA session titled ‘Comparing Models of the Solar Magnetic Field With Data’, 2011
Lead organizer and session chair of Fall AGU SPA session titled ‘Recent Advances in Solar Coronal Heating’, 2012
International 'Coronal Loops' Workshop
Steering Committee member, May 2012-present
Science Organizing Committee, 2013-present
Goddard Space Flight Center New and Developing Professionals Advisory Committee, May 2011-present
Taught introduction to solar/astronomy observational techniques course at the Goddard Space Flight Center Educator’s Workshop, July 2012
Solar and space physics presentation at the Glenn Dale Elementary School Career Day, May 2012
Solar and space weather presentation as part of The Girl Scouts of America 100th anniversary celebration, ‘The Scientist is In’ event, July 2012
Served on the GSFC Science Panel for Summer Interns, August 2012
NSF Solar, Heliospheric, and INterplanetary Environment program (SHINE)
SHINE student representative, 2008 and 2009.
Co-GEM-SHINE student day leader (GEM-SHINE 2008 meeting)
Served as a reviewer on the SHINE National Science Foundation research proposals panel review
Other Working group leader at the ‘Tracing the Connections of Eruptive Events’ workshop, Fall, 2012
Women of Aerospace,
2013
-
Present
American Astronomical Society (AAS),
2010
-
Present
American Geophysical Union,
2005
-
Present
Recipient of a NASA Early Career Achievement Medal, 2018
Recipient of the 2018 American Astronomical Society (AAS)/Solar Physics Division (SPD) Karen Harvey Prize for a significant contribution to the study of the Sun early in a person's professional career. Awarded ‘for her fundamental contributions to understanding coronal heating and the slow solar wind, and for her valuable service to the science community and the general public.’
Refereed
Kepko, L., and N. M. Viall. 2019. "The Source, Significance, and Magnetospheric Impact of Periodic Density Structures Within Stream Interaction Regions."
Journal of Geophysical Research: Space Physics,
(In Press)
[10.1029/2019ja026962]
Barnes, W. T., S. J. Bradshaw, and N. M. Viall. 2019. "Understanding Heating in Active Region Cores through Machine Learning. I. Numerical Modeling and Predicted Observables."
The Astrophysical Journal,
880
(1):
56
[10.3847/1538-4357/ab290c]
Mason, E. I., S. K. Antiochos, and N. M. Viall. 2019. "Observations of Solar Coronal Rain in Null Point Topologies."
The Astrophysical Journal Letters,
874
(2):
L33
[10.3847/2041-8213/ab0c5d]
Di Matteo, S., N. M. Viall, L. Kepko, et al. 2019. "Helios Observations of Quasiperiodic Density Structures in the Slow Solar Wind at 0.3, 0.4, and 0.6 AU."
Journal of Geophysical Research: Space Physics,
124
(2):
837-860
[10.1029/2018ja026182]
DeForest, C. E., R. A. Howard, M. Velli, N. Viall, and A. Vourlidas. 2018. "The Highly Structured Outer Solar Corona."
The Astrophysical Journal,
862
(1):
18
[10.3847/1538-4357/aac8e3]
Nita, G. M., N. M. Viall, J. A. Klimchuk, et al. 2018. "Dressing the Coronal Magnetic Extrapolations of Active Regions with a Parameterized Thermal Structure."
The Astrophysical Journal,
853
(1):
66
[10.3847/1538-4357/aaa4bf]
Strong, K., N. Viall, J. Schmelz, and J. Saba. 2017. "Understanding Space Weather: Part III: The Sun’s Domain."
Bulletin of the American Meteorological Society,
98
(12):
2593-2602
[10.1175/bams-d-16-0204.1]
Viall, N. M., and J. A. Klimchuk. 2017. "A Survey of Nanoflare Properties in Active Regions Observed with theSolar Dynamics Observatory."
The Astrophysical Journal,
842
(2):
108
[10.3847/1538-4357/aa7137]
Viall, N. M., and J. A. Klimchuk. 2016. "SIGNATURES OF STEADY HEATING IN TIME LAG ANALYSIS OF CORONAL EMISSION."
The Astrophysical Journal,
828
(2):
76
[10.3847/0004-637x/828/2/76]
DeForest, C. E., W. H. Matthaeus, N. M. Viall, and S. R. Cranmer. 2016. "FADING CORONAL STRUCTURE AND THE ONSET OF TURBULENCE IN THE YOUNG SOLAR WIND."
The Astrophysical Journal,
828
(2):
66
[10.3847/0004-637x/828/2/66]
Kepko, L., N. Viall, S. K. Antiochos, et al. 2016. "Implications of L1 observations for slow solar wind formation by solar reconnection."
Geophysical Research Letters,
43
(9):
4089–4097
[10.1002/2016gl068607]
Bradshaw, S. J., and N. M. Viall. 2016. "PATTERNS OF ACTIVITY IN A GLOBAL MODEL OF A SOLAR ACTIVE REGION."
The Astrophysical Journal,
821
(1):
63
[10.3847/0004-637x/821/1/63]
Viall, N. M., and A. Vourlidas. 2015. "PERIODIC DENSITY STRUCTURES AND THE ORIGIN OF THE SLOW SOLAR WIND."
The Astrophysical Journal,
807
(2):
176
[10.1088/0004-637x/807/2/176]
Viall, N. M., and J. A. Klimchuk. 2015. "THE TRANSITION REGION RESPONSE TO A CORONAL NANOFLARE: FORWARD MODELING AND OBSERVATIONS INSDO/AIA."
The Astrophysical Journal,
799
(1):
58
[10.1088/0004-637x/799/1/58]
Hartinger, M. D., D. Welling, N. M. Viall, M. B. Moldwin, and A. Ridley. 2014. "The effect of magnetopause motion on fast mode resonance."
Journal of Geophysical Research: Space Physics,
119
(10):
8212-8227
[10.1002/2014ja020401]
Uritskiy, V. M., J. M. Davila, N. M. Viall-Kepko, and L. Ofman. 2013. "MEASURING TEMPERATURE-DEPENDENT PROPAGATING DISTURBANCES IN CORONAL FAN LOOPS USING MULTIPLE SDO/AIA CHANNELS AND THE SURFING TRANSFORM TECHNIQUE."
ASTROPHYSICAL JOURNAL,
778:
[10.1088/0004-637X/778/1/26]
Viall, N. M., and J. A. Klimchuk. 2013. "Modeling the Line-of-Sight Integrated Emission in the Corona: Implications for Coronal Heating."
The Astrophysical Journal,
771
(2):
115
[10.1088/0004-637X/771/2/115]
Viall, N., and J. Klimchuk. 2012. "Nanoflare Properties throughout Active Regions: Comparing SDO/AIA Observations with Modeled Active Region Light Curves."
American Astronomical Society Meeting Abstracts #220,
220:
#309.04-.
Viall, N., and J. Klimchuk. 2011. "Patterns of Nanoflare Heating Exhibited by Active Regions Observed with SDO/AIA."
Bulletin of the American Astronomical Society,
2103-:
Viall, N. M., H. E. Spence, A. Vourlidas, and R. Howard. 2010. "Examining Periodic Solar-Wind Density Structures Observed in the SECCHI Heliospheric Imagers."
Solar Physics,
261
(175):
[10.1007/s11207-010-9633-1]
Viall, N. M., H. E. Spence, and J. Kasper. 2009. "Are periodic solar wind number density structures formed in the solar corona?"
Geophysical Research Letters,
36
(23):
L23102
[10.1029/2009GL041191]
Viall, N. M., E. L. Kepko, and H. E. Spence. 2009. "Relative occurrence rates and connection of discrete frequency oscillations in the solar wind density and dayside magnetosphere."
J. Geophys. Res.,
114
(A01201):
[10.1029/2008JA013334]
Viall, N. M., L. Kepko, and H. E. Spence. 2008. "Inherent length-scales of periodic solar wind number density structures."
Journal of Geophysical Research (Space Physics),
113:
[7101 10.1029/2007JA012881]
Refereed
Kepko, L., and N. M. Viall. 2019. "The Source, Significance, and Magnetospheric Impact of Periodic Density Structures Within Stream Interaction Regions."
Journal of Geophysical Research: Space Physics
(In Press)
[10.1029/2019ja026962]
Barnes, W. T., S. J. Bradshaw, and N. M. Viall. 2019. "Understanding Heating in Active Region Cores through Machine Learning. I. Numerical Modeling and Predicted Observables."
The Astrophysical Journal
880
(1):
56
[10.3847/1538-4357/ab290c]
Mason, E. I., S. K. Antiochos, and N. M. Viall. 2019. "Observations of Solar Coronal Rain in Null Point Topologies."
The Astrophysical Journal Letters
874
(2):
L33
[10.3847/2041-8213/ab0c5d]
Di Matteo, S., N. M. Viall, L. Kepko, et al. 2019. "Helios Observations of Quasiperiodic Density Structures in the Slow Solar Wind at 0.3, 0.4, and 0.6 AU."
Journal of Geophysical Research: Space Physics
124
(2):
837-860
[10.1029/2018ja026182]
DeForest, C. E., R. A. Howard, M. Velli, N. Viall, and A. Vourlidas. 2018. "The Highly Structured Outer Solar Corona."
The Astrophysical Journal
862
(1):
18
[10.3847/1538-4357/aac8e3]
Nita, G. M., N. M. Viall, J. A. Klimchuk, et al. 2018. "Dressing the Coronal Magnetic Extrapolations of Active Regions with a Parameterized Thermal Structure."
The Astrophysical Journal
853
(1):
66
[10.3847/1538-4357/aaa4bf]
Strong, K., N. Viall, J. Schmelz, and J. Saba. 2017. "Understanding Space Weather: Part III: The Sun’s Domain."
Bulletin of the American Meteorological Society
98
(12):
2593-2602
[10.1175/bams-d-16-0204.1]
Viall, N. M., and J. A. Klimchuk. 2017. "A Survey of Nanoflare Properties in Active Regions Observed with theSolar Dynamics Observatory."
The Astrophysical Journal
842
(2):
108
[10.3847/1538-4357/aa7137]
Viall, N. M., and J. A. Klimchuk. 2016. "SIGNATURES OF STEADY HEATING IN TIME LAG ANALYSIS OF CORONAL EMISSION."
The Astrophysical Journal
828
(2):
76
[10.3847/0004-637x/828/2/76]
DeForest, C. E., W. H. Matthaeus, N. M. Viall, and S. R. Cranmer. 2016. "FADING CORONAL STRUCTURE AND THE ONSET OF TURBULENCE IN THE YOUNG SOLAR WIND."
The Astrophysical Journal
828
(2):
66
[10.3847/0004-637x/828/2/66]
Kepko, L., N. Viall, S. K. Antiochos, et al. 2016. "Implications of L1 observations for slow solar wind formation by solar reconnection."
Geophysical Research Letters
43
(9):
4089–4097
[10.1002/2016gl068607]
Bradshaw, S. J., and N. M. Viall. 2016. "PATTERNS OF ACTIVITY IN A GLOBAL MODEL OF A SOLAR ACTIVE REGION."
The Astrophysical Journal
821
(1):
63
[10.3847/0004-637x/821/1/63]
Viall, N. M., and A. Vourlidas. 2015. "PERIODIC DENSITY STRUCTURES AND THE ORIGIN OF THE SLOW SOLAR WIND."
The Astrophysical Journal
807
(2):
176
[10.1088/0004-637x/807/2/176]
Viall, N. M., and J. A. Klimchuk. 2015. "THE TRANSITION REGION RESPONSE TO A CORONAL NANOFLARE: FORWARD MODELING AND OBSERVATIONS INSDO/AIA."
The Astrophysical Journal
799
(1):
58
[10.1088/0004-637x/799/1/58]
Hartinger, M. D., D. Welling, N. M. Viall, M. B. Moldwin, and A. Ridley. 2014. "The effect of magnetopause motion on fast mode resonance."
Journal of Geophysical Research: Space Physics
119
(10):
8212-8227
[10.1002/2014ja020401]
Uritskiy, V. M., J. M. Davila, N. M. Viall-Kepko, and L. Ofman. 2013. "MEASURING TEMPERATURE-DEPENDENT PROPAGATING DISTURBANCES IN CORONAL FAN LOOPS USING MULTIPLE SDO/AIA CHANNELS AND THE SURFING TRANSFORM TECHNIQUE."
ASTROPHYSICAL JOURNAL
778
[10.1088/0004-637X/778/1/26]
Viall, N. M., and J. A. Klimchuk. 2013. "Modeling the Line-of-Sight Integrated Emission in the Corona: Implications for Coronal Heating."
The Astrophysical Journal
771
(2):
115
[10.1088/0004-637X/771/2/115]
Viall, N., and J. Klimchuk. 2012. "Nanoflare Properties throughout Active Regions: Comparing SDO/AIA Observations with Modeled Active Region Light Curves."
American Astronomical Society Meeting Abstracts #220
220
#309.04-
Viall, N., and J. Klimchuk. 2011. "Patterns of Nanoflare Heating Exhibited by Active Regions Observed with SDO/AIA."
Bulletin of the American Astronomical Society
2103-
Viall, N. M., H. E. Spence, A. Vourlidas, and R. Howard. 2010. "Examining Periodic Solar-Wind Density Structures Observed in the SECCHI Heliospheric Imagers."
Solar Physics
261
(175):
[10.1007/s11207-010-9633-1]
Viall, N. M., H. E. Spence, and J. Kasper. 2009. "Are periodic solar wind number density structures formed in the solar corona?"
Geophysical Research Letters
36
(23):
L23102
[10.1029/2009GL041191]
Viall, N. M., E. L. Kepko, and H. E. Spence. 2009. "Relative occurrence rates and connection of discrete frequency oscillations in the solar wind density and dayside magnetosphere."
J. Geophys. Res.
114
(A01201):
[10.1029/2008JA013334]
Viall, N. M., L. Kepko, and H. E. Spence. 2008. "Inherent length-scales of periodic solar wind number density structures."
Journal of Geophysical Research (Space Physics)
113
[7101 10.1029/2007JA012881]
